To address issues such as reverse power flow

voltage fluctuations

and insufficient power supply capacity resulting from the increased penetration of distributed generation in distribution networks

an optimized control strategy for active distribution substations incorporating a three-terminal intelligent soft open point (E-SOP) for energy storage is proposed. Firstly

the topology of E-SOP is thoroughly analyzed

and a corresponding mathematical model is established to lay the foundation for subsequent optimization control. Secondly

a site selection and planning model for the E-SOP based on voltage-power sensitivity is proposed to determine its optimal installation location. On this basis

a multi-objective optimization model is developed

aiming to minimize comprehensive costs and voltage deviations

to configure the capacity of the E-SOP. This model is transformed into a second-order cone programming model using conic relaxation techniques and solved iteratively through a particle swarm optimization algorithm. Finally

simulations on an IEEE 33-node flexible interconnected system validate the effectiveness of the proposed strategy

and further simulations on an IEEE 69-node system confirm its applicability and superiority. The results indicate that

compared to traditional systems without E-SOP interconnection

the proposed strategy reduces voltage deviation by 2.24%

daily average system losses by 50.41%

and overall costs by 21.74%

making it suitable for distribution systems of various scales.